Coil for dynamo-electric machines.



N5. 755,537. PATEN'TED MAR. 22, 1904; P. PORSCHE .LOHNBRI COIL POR DYNAMO TR1@ MACHINES. LLLLLLLLLLLLLLLLLLLLLLLLLL 2.

El@ I i UNITED STATES Patented March 22, 1904.

l ATENT OFFICE.

FERDINAND PORSCHE AND LUDWIG LOHNER, OF VIENNA, AUSTRIA- HUNGARY.

COIL FOR DYNANlO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 755,537, dated March 22, 1904.

Application filed .Tuly ll, 1902. Serial No. 115,204. (No model.)

T all whom, t may concern:

Be it known that we, FERDINAND PORSCHE,

engineer, residing at 6 Berggasse, and LUD- WIG LoHNER, manufacturer, residing at 2 Porzellangasse Vienna IX, Austria-Hungary, subjects of the Emperor of Austria-Hungary, have invented certain new and useful Improvements in and Relating to Coils for Dynamo- Electric Machines, of which the following is a specification.

The present invention consists in a method of manufacturing coils for the field-magnets of dynamo-electric machines, whereby besides the attainment of other advantages the coils can be simply and quickly manufactured at a very reduced cost.

In the accompanying drawings,l Figures I and 2 illustrate in side and front elevation, respectively, the field-magnets of a dynamoelectric machine provided with the improved coils; and Figs. 3 to 6 illustrate the method of manufacturing the coils.

As is well known, the cylindrical spools or coils of the held-magnet 3 of a dynamo-electric machine have a concavo-convex outline when seen from the side, whereby they are enabled to lie close to the circumference of the ring 2 in surrounding disposition to the field of movement of the revolving armature. According to the present invention these spools are made up of a metallic band or strip (preferably of copper) instead of wire, bound together with an insulating-band separating each two adjoining metallic layers, the whole being wound upon a suitable core. i designates the metallic band, and 5 the insulatingtool. As thus wound the coil has the shape shown in Figs. 3 and 4. Thereupon in order to acquire the concavo-convex shape, so as to lie properly in the ring 2 of the eld, each coil is cut away, as shown in Fig. 6. The whole is then wrapped by an insulating-covering 6, as shown in Fig. 5, leaving only the terminals 7, serving for electrical connection, protruding. It is preferred to carry out the winding under a comparatively high temperature in order to obtain a close and intimate adhesion between the several layers.

Having thus fully described our invention, what we claim as new,` and desire to secure by Letters Patent, is-

l. rIhe process of manufacturing spools or coils for dynamo-electric machines out of a metallic band and a band of insulating material which consists in winding the said bands in laminated arrangement together into the form of a coil, and thereafter cutting away the superfluous portions of the same in order to give the coil the required concave-convex form, substantially as described.

2. The process of manufacturing spools or coils for dynamo-electric machines out of a metallic band and a band of insulating material which consists in winding the said bands in laminated arrangement together into the form of a coil, and at a temperature higher than the atmospheric temperature, and thereafter cutting' away the superfluous portions of the same in order to give the coil the required concavo'- convex form, substantially as described.

In testimony whereof we have hereunto set our hands in presence of two subscribing witnesses.`

Witnesses:

FRANZ REICHNER, ALvEsTo S. HoGUE. 

